Ellsworth brown



(No Model.)

E. BROWN. PUSH SCREW DRIVER. No. 447,277. Patented Feb. 24, 1891.

' I UNITED. STATES PATENT OFFICE.

ELLswoRTH BROWN, o F DAYTON, OHIO, AssIeNoR OF ONE-HALF To JAMES HAYS, OF SAME PLACE.

PUSH SCREW-DRIVER.

SPECIFICATION forming part of Letters Patent No. 447,277, dated February 24, 1891. Application filed May l6,'1890. Serial No. 351,999, (No model.)

useful Improvements in Push Screw-Drivers;-

and I do declare the following to be a full, clear, and exact description of the invention,

7 such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specifica-' tion.

Figure 1 of the drawings is a face view of the device, partly in section. Fig. 2 is a sectional view of the bit-holder and bit. Fig. 3 is a modification of the auger-bit holder and the bit-holder c detached.

This invention relates to certain improvements in screw-drivers; and it consists in the construction and novel combination of parts, as will hereinafter appear from the following description and accompanying drawings.

In the drawings, A is a central cylindric stem or spindle, upon which is loosely arranged the finger hold or sleeve 1), resting at its lower end against a shoulder a upon said stem or spindle. Below the shoulder a is the bit-holder c, which has an oblong opening 0', intersecting the bit-receiving slot 0 which extends lengthwise of said holder and opens at its lower end. The bit-holder c has an aperture d near the upper end wall of the opening 0', and in the lower end wall of the latter is a recess (1, which is engaged by the inwardly-bent or lateral end portions of a spring-clasp (2, one of said lateral end portions also passing through or engaging an aperture d in the bit e, reversible end for end, thus effectively holding the bit in place.

B B are serpentine or spirally-arranged guide-wires traversing the central spindle or stem A, and secured at their lower ends to a head or collar f, through which said stem or spindle passes, and which is limited in its downward movement by the finger-hold I). These spiral guide-wires B B pass through a head g, fast to the upper end of the spindle or stem A, and are connected, or screwed at their upper ends to a circular plate or disk h, having fitted upon it the sectional knob or handle 0, the outer section thereof being fixed to said disk or to a stem thereof, while the inner section is loose thereon, having a tubular collar 0 adapted to receive both the head g and disk h. The inner section of the knob or handle 0 being loose permits the driver to be drawn backward while the bit is in engagement with the slot in the head of the screw without moving the screw.

In the modification of Fig. 3 is shown an auger-bit holder 0, which has at one end a socket to, having an adjusting or holding screw a to secure the auger-bit, while at its opposite end is a second socket a which is slipped over the screw-driver-bit holder without requiring the removal of said screwdriver bit, and'which has openings or apertures f, through which is passed the end por- 7o tions of the clasp e, securing said auger-bit holder in place.

Having described this invention, what I claim, and desire to secure byLetters Patent, 1s

1. The screw-d river having the central spindle, upon the upper end of which is secured a head, the lower end of said spindle passing through a collar, and the double spirally-an ranged guide-wires passing through said head and connected at their upper ends to a disk having the fixed section of the knob, the loose section of said knob receiving said head and disk, and the lower ends of said spirally-arranged wires secured to said collar, substantially as and for the purpose set forth.

2. In a screw-d river, the combination, with the spindle having the bit-holder provided with the lateral opening and the aperture and recess, of the spring-clasp having lateral end portions engaging said aperture and said recess, and an aperture in the bit, the aperture in the bit-holder being arranged near the upper end wall of raid opening, and said recess being arranged in the lower end wall 5 of said opening, substantially as set forth.

3. In a screw-driver, the combination, with the spindle or stem and its bit-holder, of the auger-bit holder having a socket at each end, one provided with a set-screw and the other 5 with apertures for engagement therewith of the screw-driver-bit-fastening clasp, substantially as specified.

In testimony whereof I affix my signature in presence of two witnesses.

ELLSWORTI'I BROWN.

Witnesses:

E. THOMPSON, R. M. NEVIN. 

